I agree with both Sharke and CBJ. Reaper is a great DAW, but yes, you can still get quite a bit of mileage out of Sonar, even if it never experiences a resurrection (hey, Spring is coming, who knows?).
My path actually has led backwards rather than forwards, following "the news." My experience is probably unique. I started with Home Studio 6 in the late 90's, progressing up to 8.5.3 Producer. That's when the problems started. Producer had various glitches for me, causing frequent crashes and hyper-vigilance. For example, if I suddenly stopped playback while my EWSO basses were playing, Sonar would crash. This weird bug could not be solved by Cakewalk or East West support. I should have upgraded, but went to Reaper instead, where eventually I was able to develop a workflow which I pretended was as fast as Sonar's.
Then, the news hit. I wanted to see what version of Sonar I could go forward with, if Sonar was to be no more. I remembered I had 8.5 Studio. I barely had used it, upgrading quickly to Producer. To my surprise, it had none of the glitches that Producer had. So, I have gone back to 8.5 Studio. My workflow is faster than it has ever been, and no crashes.
I tried the "free" Home Studio, really liked it, but found I needed an Event List. As for Reaper, it's not that well-suited for orchestral composers. Midi routing is a painful process. It took at least a week for folks on the forum to finally get me doing it right. And Reaper has some weird behavior on a really long piece. Toward the end, it would jump back to the beginning every time I made a CC change. Not great for the workflow. I am hopeful that in time Reaper will evolve to the point where I can use it efficiently. The incredible notation editor they developed almost overnight gives me hope. But it just doesn't seem like the devs have classical music in mind. However, as I said my experience is probably unique. The vast majority of Sonar users would do just fine on Reaper.
We're all free to do what we want. Stay or go. Go forward, go backward. The only thing I don't like is people slamming each other for their choices. Or slamming a product that doesn't work well for them, while for others it's ideal. Report your experience, maybe it will be helpful to others. That's what I try to do.